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Salvia is the biggest genus from Lamiceae, with almost 900 species. In Argentina it is represented by 23 taxa (20 species, one subspecies, and two varieties), four of these are adventive taxa, the rest are native, and one of these is endemic. Species are distributed predominantly in the north region of the territory, reaching the provinces of La Pampa and Mendoza as the southern limit of its distribution. Each of the 23 Salvia taxa present in Argentina is described and illustrated, and a key for their identification is presented. Three new synonyms are proposed, Salvia borjensis new synonym of Salvia nervosa, Salvia durifolia new synonym of Salvia ovalifolia var. ovalifolia and Salvia alba new synonym of Salvia personata, and ten lectotypes are designated for: Salvia approximata, S. arenaria, S. ovalifolia var. villosa, S. pallida, S. procurrens, S. reflexa, S. serrata, S. stachydifolia, S. uliginosa, and Salvia sect. Pycnosphace. [ABSTRACT FROM AUTHOR]

Azorella is a genus with 26 species of Azorelloideae (Apiaceae) that grow from Costa Rica to the subantartic islands, being distintive and dominant in different environments of the Andean Cordilleras from Venezuela to Patagonia. The species of Azorella that grow in Argentina have been revised taxonomically in a previous study. However, knowledge of the remaining species is fragmentary and uneven. The aim of this paper is to update and standardize the information of the 11 species of Azorella absent in Argentina and present in Bolivia, Chile, Colombia, Ecuador, Peru and/or Venezuela. We provide descriptions for those species and update distributional maps, and we solve nomenclatural and typification problems for 41 names, designating 2 type species, 16 lectotypes and 1 neotype. In addition, we provide 10 new illustrations, and an identification key for all the species of the genus. [ABSTRACT FROM AUTHOR]

Based on morphological, anatomical, and phylogenetic studies within subfamily Allioideae, a new circumscription of tribe Leucocoryneae is presented including six American genera: Beauverdia, Ipheion, Leucocoryne, Nothoscordum, Tristagma and Zoellnerallium. A synopsis of tribe Leucocoryneae, comprising its description (as amended), a key to tribes, a key to genera within Leucocoryneae, genera descriptions and their geographical distribution are included. [ABSTRACT FROM AUTHOR]

A review of the Lycopodiaceae from Argentina and Uruguay, based on the study of relevant collections from herbaria as well as literature, is presented, according to the new classification of 16 genera grouped into three subfamilies. The family is represented by nine genera and 23 species; all taxa are described and at least one species of each subfamily is illustrated; one species (Huperzia saururoides) is lectotypified and three new synonyms are proposed: Austrolycopodium assurgens under Austrolycopodium erectum, Lycopodium sanctae-barbarae under Phlegmariurus saururus and Urostachys selago var. aschersonianus under Huperzia saururoides. Lycopodiella alopecuroides and Phlegmariurus subulatus are excluded from the studied area. Keys for all taxa are provided, as well as the relevant synonyms and a synthesis of the ecology and distribution. The most diverse genera are Phlegmariurus (seven species) and Austrolycopodium (five species). In Argentina, the family is represented by 22 species distributed in the three subfamilies. The northwestern region is the richest area of the country, with nine species. In Uruguay the family is represented by the subfamily Lycopodielloideae, with four species belonging to the genera Lycopodiella (two species), Palhinhaea (one species) and Pseudolycopodiella, represented by Pseudolycopodiella meridionalis. The latter, Palhinhaea camporum, and Huperzia fuegiana s. str. are new records for Argentina. [ABSTRACT FROM AUTHOR]

The morphological variation in vegetative and reproductive structures of Bauhinia mollis (var. mollis and var. notophila) and B. argentinensis (var. argentinensis and var. megasiphon) were studied. This detailed morphological study enabled us to correctly identify herbarium specimens and expand the geographic distribution of the taxa. New records of B. mollis var. mollis for Argentina and B. argentinensis var. argentinensis and B. argentinensis var. megasiphon for Bolivia, the latter considered endemic to Argentina, are here confirmed. Lectotypes were designated for Bauhinia mollis, B. mollis var guaranitica and B. appendiculata. [ABSTRACT FROM AUTHOR]

A taxonomic treatment of the genus Diplolepis is here presented. Based on molecular and biogeographical information recently published, this group is monophyletic and its geographical distribution is restricted to southwestern South America. The study comprised the analysis of herbarium specimens including nomenclatural types, supplemented with collections and observation of species in the field. This paper describes the variation in the morphology of the genus, including habit, stems, leaves, inflorescence, calyx, corolla, corona, gynostegium, pollinia, fruits and seeds. The morphological and distributional differences between Diplolepis and related genera are discussed. A key to differentiate the species of the genus is here given. Within each species we provide the valid name, synonyms, description of vegetative and reproductive morphological characters, geographical distribution, ecology, uses, common names, phenology, iconography and specimens examined. A lectotype is designated for D. viridis. [ABSTRACT FROM AUTHOR]

After the most recent phylogenetic analyses of Gavilea, an updated taxonomic revision is presented here. A new combination, Gavilea chica, is proposed following the current monophyletic circums- cription of the genus. This revision includes: 1) the history of the genus, 2) a key to the 17 species of Gavilea, 3) descriptions and illustrations of most species, 4) updated geographical distribution of the species, including the extension of the range of distribution of G. platyantha and G. supralabellata to Río Negro and Tierra del Fuego (Argentina) respectively, 5) nomenclatural observations and, 6) a complete and updated list of synonyms for every species. Five lectotypes (Asarca araucana, G. australis, A. patagonica, G. supralabellata, and G. wittei) are also designated. [ABSTRACT FROM AUTHOR]

Guadua tagoara subsp. tagoara is reported for the first time in Argentina, it is described and illustrated. A map showing its geographical distribution in South America and a key to the species and subspecies in Argentina are also provided. A lectotype for Bambusa distorta is here designated. [ABSTRACT FROM AUTHOR]

Miconia petropolitana is reported for the first time for the Argentinean flora and a lectotipification for this species is proposed. The species is described and illustrated and a map with the geographical distribution is provided. Miconia elegans is excluded from Argentina and an identification key for the species is included. [ABSTRACT FROM AUTHOR]

The species in the Sporobolus indicus complex are analyzed for Argentina. Sporobolus indicus var. indicus and S. indicus var. andinus are recognized for Argentina based on significant value differences in culms height and inflorescence length, and the altitude of collection area. The var. andinus is a new record for the Argentinean flora and it is here illustrated. Sporobolus jacquemontii is excluded from Argentina and S. minor is considered as a synonymy of S. indicus var. indicus. [ABSTRACT FROM AUTHOR]

A new record for the Argentinean flora, Samanea tubulosa, is described and illustrated. The specimens were collected in Oran, Salta Province, Argentina, in the "Selvas Pedemontanas" district of the "Yungas" phytogeographic province. Comments on the systematic position of the species and related genera are given. [ABSTRACT FROM AUTHOR]

Peperomia nitida and P. armondii (Piperaceae, subgen. Rhyncophorum) are recorded for the first time for the Argentinean flora in the province of Misiones. The species are described and illustrated, and their geographical distributions are updated. A key to distinguish the Argentinean species of subgen. Rhyncophorum is included, and P. elongata is excluded from the Argentinean Flora. [ABSTRACT FROM AUTHOR]

The genus Diastatea (Campanulaceae, Lobelioideae) is recorded for the first time for Argentina in antropic enviroments of the Yungas phytogeographic province (Jujuy), between 1,100 and 2,000 m. We describe and illustrate D. micrantha, the only species collected up to now, including a key to discern it from Lobelia xalapensis, its closest taxon. [ABSTRACT FROM AUTHOR]

The most recent studies about the genus Tabebuia and Handroanthus recognize two and six native species in Argentina, and one exotic cultivated species of Handroanthus in urban streets. Nevertheless, the genera are not completely understood, because some taxonomic conflicts are mentioned for the NWof Argentina (NWA). New collections made in Salta and Jujuy, and the revision of an important number of herbarium samples have confirmed a very high variability among the populations of the NWA region, and the subsistence of conflictive situations that prevented the correct identification of the species. Consequently, we considered it was necessary to make the revision of the genus analizing comprehensive material including all the phenological phases, in order to study most characters of every plant organ (young leaves, mature leaves, inflorescences, flowers, fruits and seeds). Our results indicate that the number of native taxa of Handroanthus is seven, including a new variety, and two of Tabebuia. Besides, another cultivated species of Tabebuia was identified, so there are two exotic taxa. All the entities are described, as well as the extant variability of native populations, and their distribution ranges in Argentina are provided. [ABSTRACT FROM AUTHOR]

This is the first complete, floristic analysis of the Asteraceae family from an extense, endangered, subtropical area of Argentina, covered by the Misiones Province. This study reports 88 genera, 345 species and 16 infraspecific taxa of Asteraceae from the two phytogeographic units of Misiones Province: "Selvas Mixtas" District, and "de los Campos" District. Nine species are recorded for first time, and 23 are included as probable records for this area. This paper includes keys for tribes, genera, species and infraspecific taxa, as well as a short discussion about distribution of tribes, genera and habits in relation to political departments or phytogeographic districts. Habit, status, distribution, habitat, vernacular names, uses, and vouchers are given for every taxon. Thirty two taxa are illustrated for the first time. [ABSTRACT FROM AUTHOR]

Digitaria cuatrecasasii, a new species from Honduras, Panamá, Colombia and Venezuela, is described and illustrated. The taxonomic position of D. cuatrecasasii is discussed, and its inclusion in sect. Leianthae is proposed. A comparative table and some remarks about the related taxa are included. Digitaria californica var. villosissima, D. corynotricha, D. curvinervis, D. fragilis and D. sacchariflora are reported for the first time for Colombia. Digitaria aequiglumis var. aequiglumis, D. argillacea var. nulliseta, D. ciliaris var. rhachiseta, D. costaricensis, D. eriantha, D. filiformis var. laeviglumis, D. lehmanniana var. dasyantha, D. parva, D. sacchariflora and D. ternata are cited for the first time for Venezuela. Digitaria cardenasiana and D. villiculmis are here sinonimized under D. corynotricha, and D. aequatorienis under D. pittieri. The following new records for countries are included as follows: D. argillacea var. argillacea for Perú, D. argillacea var. nulliseta for Guatemala, D. curvinervis for Ecuador and México, D. eriantha for Ecuador, D. fragilis for Nicaragua and Panamá, D. lehmanniana var. lehmanniana for Cuba and D. leucites for México. This paper includes synonymy, iconography, geographical distribution and ecology, vernacular names, specimens examined; a key for the identification of taxa is also given. Eleven species are illustrated for the first time. [ABSTRACT FROM AUTHOR]

Vicia macrograminea is confirmed for Argentina precisions about V. epetiolaris, V. graminea var. transiens and V. stenophylla are given. The geographical distribution of V. graminea is extended, and a new variety, Vicia epetiolaris var. microcarpa, is proposed. Also, the presence of V. andicola and V. setifolia in northwestern Argentina is confirmed. A key and illustrations to differentiate all studied species are included. [ABSTRACT FROM AUTHOR]

Materials from Argentina of adventitious species of Viola were examined and four species were confirmed: V. arvensis, V. metajaponica, V. odorata and V. tricolor. V. metajaponica is lectotypified, and the identity of V. japonica is discussed. A key to identify the species, their descriptions, illustrations, ecology and geographic distribution are given. [ABSTRACT FROM AUTHOR]

This work describes the structure and composition of plant communities from four wetland located in the Copahue Provincial Park (Neuquén Province, Argentina). The study was performed according to the method of the Zürich - Montpellier phytosociological School. Plant communities were distributed along an altitudinal gradient within the inferior montane belt, ranging from 1,400 to 1,800 m, and relationships with the superior montane belt wetlands (1,800 to 2,300 m) were established based on their floristic composition. Four new associations and one subassociation, grouped in the new alliance Juncion lesueurii, arise from the analysis of the syntaxonomical interpretation. [ABSTRACT FROM AUTHOR]

Cedrela is represented in Argentina by 5 taxa. A new species, Cedrela saltensis, is described and illustrated. A key, descriptions, synonymy, geographical distribution and illustrations of the Argentinian species are also provided. [ABSTRACT FROM AUTHOR]

Schwartzia is a small genus of 17 species distributed in wet lowland forests or montane cloud forests from Costa Rica to southern Brazil, and also in the Lesser Antilles; it belongs to the Marcgraviaceae, a Neotropical family. Three species are considered in this paper for Brazil and one of these is described as a new species. The three taxa are endemic to Brazil. Each taxon is described; a key to identification of the species as well as information on distribution and ecology are also provided. [ABSTRACT FROM AUTHOR]

A detailed floristic inventory as well as a preliminary phytogeographical analysis was conducted in an Andean secondary wet forest of NW of Colombia, in order to know the vascular species richness and the phytogeographical relationships. The floristic inventory revealed the presence of 712 vascular species distributed among 129 families, of which 17 belong to ferns and allies, with 69 species and 30 genera; 18 monocotyledon families, with 153 species and 87 genera, and 94 dicotyledon families, with 490 species and 290 genera. The best-represented plant families are Melastomataceae (36 species), Rubiaceae (36), Orchidaceae (30), Asteraceae (28), Poaceae (28), Piperaceae (24), Araceae (23), Fabaceae (20), Clusiaceae (18), Moraceae (18), Gesneriaceae (17), Mimosaceae (16), Solanaceae (15), Acanthaceae (14), and Polypodiaceae (13). The richest genera are Piper (17 species), Ficus (11), Psychotria (11), Inga (10), Anthurium (9), Miconia (9), Peperomia (7), Asplenium (6), Blechnum (6), Clidemia (6), Costus (6), Mikania (6), Selaginella (6), and Solanum (6). Regarding life forms, herbs are the best represented with 344 species (48,2%), followed by shrubs and trees (291 species, 41%), lianas (62 species, 8,7%), palms (12 species, 1,7%) and by arborescent herbs (3 species, 0,4%). There are 101 epiphytic or hemiepiphytic species belonging to 23 families. The richest families in epiphytes are Orchidaceae (23 species), Araceae (10), Bromeliaceae (8), Piperaceae (7) and Gesneriaceae (6), while the most common epiphytic genera are Peperomia (7 species), Anthurium (6), Telephotos (5), Huperzia (4) and Trichomanes (4). There are 9 endemic species (1,3%). Some of the species collected are new to science or are new records for the flora of NW of South America. Nine species and 3 genera exhibit a disjunct distribution. The analyzed forest is floristically similar to lowland Neotropical forests. The phytogeographic analysis shows that 62,4% of the genera are neotropical, 25,8% are pantropical, 10% are cosmopolitan, 1,8% are holarctic, and that 15 genera have a tropical amphipacific distribution. Nine genera are confined to South America. Although the area studied was strongly modified, only 8 species are introduced or naturalized. The frequency of disturbances, such as fire, grazing, cutting, selective cutting, abandoned cultivat fields, maintains the area at early successional stages. [ABSTRACT FROM AUTHOR]

Paspalum L. has a large number of species with a wide morphological variability and extensive geographical distribution. Species of the genus grow in very diverse habitats, from humid or aquatic environments to dry places with clay or sandy soils, frequently saline. Given the diversity of habitats where the species of Paspalum occur, foliar anatomical characters were studied in order to explain different adaptative strategies. A description of the foliar anatomy of the genus is given, and several characters are discussed in relationship to the habitat. [ABSTRACT FROM AUTHOR]

The presence of the genus Rhipidocladum McClure is confirmed for Argentina, represented by two species. Rhipidocladum neumannii Sulekic, Rúgolo & L.G. Clark sp. nov., found in flowering and vegetative condition in Argentina, in Salta and Tucumán, and Bolivia, is described and illustrated. The presence of R. racemiflorum (Steud.) McClure is documented for the first time for the northwestern region of Salta. Rhipidocladum is described and the differences with the genus Merostachys Spreng. are included in a key. Some remarks about the morphology, flowering, geographical distribution and a doubtful specimen have been made. [ABSTRACT FROM AUTHOR]

The Marcgraviaceae is a small-sized neotropical family with 8 genera and perhaps 110 species mainly distributed in Colombian Amazonia, Costa Rica, Panama and Andean Colombian and Peruvian montane rain forests. Five genera and 27 species were recorded from Colombian Amazonia, where the most diverse genus was Marcgravia (13 species), followed by Souroubea (6 species), Marcgraviastrum (4 species), Norantea and Ruyschia with 2 species each. Based on a phenetic biogeographical classification, comparisons of diversity, distribution, affinity, and endemism among different Neotropical regions are provided. Although the knowledge of the Marcgraviaceae is still incomplete, some features with regard to their diversity and distribution in the Neotropic begin to emerge: 1. The Marcgraviaceae are more diverse in Western Amazonia, particularly Colombian Amazonia, than other areas (e.g., southern Mexico and southern Brazil); 2. Narrow endemic species appears to be low (ca. 24%); 3. Fifty percent of the Marcgraviaceae have a restricted distribution to a phytogeographical Region level; 4. The distribution of the numerous wide-ranging species are more or less patchy; 5. This family showed its highest endemism in northwestern of South America (Peru and Colombia); 6. The geologic history of the Andes has played an important role in the distribution and evolution of the Marcgraviaceae. For instance, most of the species diversity of several genera tends to be concentrated in Central America (Norantea), the Colombian Andean Region (Marcgraviastrum), or Western Amazonia (Marcgravia), and these areas correspond to areas of different geologic age. The Marcgraviaceae seems to have originated in South America and thus probably migrated to Central America. [ABSTRACT FROM AUTHOR]

The presence of Gloxinia gymnostoma Griseb. and Gloxinia nematanthodes (Kuntze) Wiehler for NW Argentina is reviewed. The first, has been previously cited with mixed materials and in consequence, with incorrect delimitation. Geographical distribution, morphological differences and pollen grain characters between both Argentinian entities of Gloxinia, are briefly pointed out. G. gymnostoma is here lectotypified. [ABSTRACT FROM AUTHOR]

The lichen species Ephebe ocellata Henssen is reported from South America and Lecidea plana (Lahm) Nyl. from Argentina, both for the first time. New localities are reported for the following species: Acarospora schleicheri (Ach.) Massal., Candelariella vitellina (Ehrh.) Muller Arg, Dimerella lutea (Dickson) Trevisan, Lecanora rupicola (L) Zahlbr, Rhizocarpon germinatum Korber y Rhizocarpon grande (Florke ex Flotow) Arnold which widen the knowledge of their geographic distribution. The morpho-anatomical characters and chemical reactions are given. [ABSTRACT FROM AUTHOR]

In this paper the systematic revision of Thelypteris subg. Amauropelta from the 3 South Brazilian states is given and 20 species are described for this region. A brief local history of the taxa is presented. The systematic treatment includes a description of the family, a key for the Brazilian genera of Thelypteridaceae, a description of the subgenus Amauropelta and a key for its taxa Descriptions, regional synonymies, interspecific relations, illustrations, ecology and geographic distribution for all entities are also given A new species and seven new combinations are proposed and many names are cited or applied for the first time for plants of this region. [ABSTRACT FROM AUTHOR]

Taxonomic differences between the genera Diplachne and Leptochloa are here sumarized. A key is included in order to reconize both genera in the area under study The taxonomic treatment includes five species of Diplachne and five species and one variety of Leptochloa and a key for identification. Synonyms, geographic distribution, studied material and illustrations are included. Excluded species are listed at the end of the treatment. [ABSTRACT FROM AUTHOR]

The Phallales flora of central and west Argentina is revised Six genera and 11 species are recognised, Phallus rubicundus (Bosc) Fr. and Blumenavia rhacodes Moll are new reCORDs for Argentina, and the distribution area of 8 species is enlarged. A taxonomical key to the species is included. Exomorphological and anatomical studies were performed in all species An ontogenetical study was undertaken in Clathrus argentinus Domínguez, Lysurus periphragmoides (Klotzsch) Drign, Itajahya gatericulata Moll. and Phallus rubicundus (Bosc) Fr. [ABSTRACT FROM AUTHOR]

Thirty samples of honeys were analysed using the techniques proposed by Louveaux et al. (1978); 62 morphological types were identified. From the total, 53 belong to nectar plants and 9 to pollen plants. Nineteen samples had a mixed floral origin and 11 were monofloral from Lotus tenuis Waldst. et Kit. and Eucalyptus L' Hér. The analyses permitted botanic and geographic characterization of the honey. [ABSTRACT FROM AUTHOR]

Taxonomic survey of Aureliana Sendtner, a small neotropical genus of 5 species: A. fasciculata (Vellozo) Sendt. [with 3 varieties: var. fasciculata, var. tomentella (Sendt.) Barboza et A. T. Hunz. nov. comb., and var. longifolia (Sendt.) A. T. Hunz. et Barboza nov. comb.], A. brasillana (A. T. Hunz.) Barboza et A. T. Hunz. nov. comb., A. tomentosa Sendt., A. velutina Sendt. and A. wettsteiniana (Witas.) A. T. Hunz. et Barboza nov. comb. The 7 taxa grow in Brazil, but 3 of them deserve a special mention: A. fasciculata var. tomentella reaches southeastern Paraguay and Argentina (eastern Misiones); instead A. fasciculata var. longifolia and A. fasciculata var. fasciculata show a rather peculiar distribution because aside of their eastern area, both have been collected in Bolivia (Santa Cruz and Pando). After a discussion on the complicated taxonomical history of the genus, the authors point out its relationships with 6 allied genera of the Solaneae, above all with Capsicum L.; a key to identify these 7 genera is included as well. Each taxon is described together with remarks about their geographical distribution and affinities. Five plates and a map are included in the text. [ABSTRACT FROM AUTHOR]

Burkart (1952) cited six species of Inga Miller for Argentina: I. marginata Willd., I. virescens Benth., I. affinis D. C., I. urugüensis Hook. f. et Arn., I. saltensis Burkart and doubtfully I. edulis C.Martius. As consequence of the present study, I. saltensis is transferred from the Sect. Pseudinga to the Sect. Inga (= Euinga Benth.) because of its mature legume. The presence of I. edulis var. parviflora is confirmed, not I. edulis var. edulis. Descriptions, illustrations, observations, keys to the species and maps of geographical distribution are given. [ABSTRACT FROM AUTHOR]

In the present paper the genus Junellia Mold. is accepted as such, and the limits towards related genera defined by means of a key. It is proposed to divide the genus into two subgenera: Junellia (with sections Junellia and Guedesia sect. nov.) and Thryothamnus (Phil.) stat. nov. (with sections Thryothamnus, Verticiflora (Schauer) stat. nov. and Junelliopsis sect. nov.), keys are provided for the identification of the infrageneric taxa here accepted, together with a provisional list of the species included. The type species of both subgenera are illustrated, and available information on karyology and geographical distribution is given, with a map showing the total range of the genus. A SEM study of the external and internal morphology of the mericarps with illustrations of diagnostic characters of the subgenera, and related genera are also included. [ABSTRACT FROM AUTHOR]

This paper is a taxonomic revision of the genus Polygonum L in Argentina, with a discussion of the morphological characters of taxonomic importance, a description of the genus and a classification of the 20 species treated in 5 Sections. Polygonum (5 species), Amblygonon Meisner (1 species), Persicaria Meisner (11 species), Echinocaulon Meisner (2 species) and Tiniaria Meisner (1 species). For each species a description, illustrations of interesting characters, geographical distribution, observations and conclusions about the study of the type material, the information about karyology, phenology and probable uses are included. Some species or varieties previously cited for Argentina have been reduced to synonymy (Polygonum meisnerianum var. beyrichianum, P. lanigerum, P. portoricense, P. acuminatum var. microstemon and var. glabrescens, P. punctatum var. aquatile, P. berteroi, P arenastrum, P. persicarioides, P. cordobense and P. rivulare), P. polygaloides, P. spergulariaeforme and P. tenue are taxa erroneously cited for our country, while P. dumetorum is considered of doubtful presence in Argentina. [ABSTRACT FROM AUTHOR]

The genus Bauhinia comprises around 250 species and its distribution is pantropical. Six entities recognized for Argentina are grouped in three seccions: I. Bauhinia secc. Benthamia Fortun. et Wund. with B. uruguayensis Benth.; II. Bauhinia secc. Schnella (Raddi) Benth. p. p. with B. microstachya (Raddi) Macbr. and III. Bauhinia secc. Pauletia (Cav.) DC with B. bauhinioides (Mart.) Macbr., B. argentinensis Burk., B. forficata Link subsp. pruinosa (Vog.) Fortun. et Wund. and B. mollis (Bong.) D. Dietr. var. notophila (Griseb.) Fortun. B. argentinensis Burk. var. megasiphon (Burk.) Fortun. nov. comb. is proposed, as well as B. candicans Benth. is reduced to the synonymy of B. forficata Link subsp. pruinosa (Vog.) Fortun. et Wund. nov. comb.; also the synonymy of each section are presented. The species are described indicating its synonymy and geographical distribution and a key for their differentiation is included. [ABSTRACT FROM AUTHOR]

Six species of "phycomycetes", occurring as parasites fo Algae and Fungi are described: Chytridium olla on Oedogonium sp., Olpidium entophytum on Nitella sp., Olpidiopsis saprolegniae var. saprolegniae on Saprolegnia sp., Lagenisma coscinodisci on Coscinodiscus perforatus aff. var. cellulosa, Woro nina glomerata on Vaucheria gemmata and Myzocytium proliferum on Spirogyra lenticularis. All of them, excluding the latter are new records for Argentina, and thus widen their geographic distribution. [ABSTRACT FROM AUTHOR]

A taxonomic revision of the American section Parviglumia of the genus Panicum is presented. Six species are treated, including a description of the section and a key and descriptions of the different species; the respective data of geographycal distribution and a list of the examined herbarium material is given for each taxa. Panicum cayoense is recorded for the first time from Mexico and P. arundinariae from Colombia, Venezuela and Ecuador Panicum schiffneri and P. schmitzii are reduced to synonymy of P. trichidiachne and P. conchatum and P. breviramosum to synonymy of P. arundinariae. [ABSTRACT FROM AUTHOR]

The genus Chuquirags as here treated comprises 19 species of xerophyllous bushes of South America; the history and systematic relationships within the genus and with other genera, and the morphology, geographical distribution and economic importance of the species are discussed. The taxonomic treatment includes a description of the genus, keys to the sections, series and species, and a list of excluded names. All the taxa are described and illustrated and distribution maps are given. In many cases, nomenclatural problems, intraspecific variability and affinities between the species are also analyzed. In this revision a new infrageneric classification is proposed, the genus being divided into two sections: Acanthophylla nov. sect., and Sect. Chuquiraga with two series-Parviflorae nov. ser. and Ser. Chuquiraga. Other taxonomical novelties are: Two new subspecies are described (Ch. spinosa Less. Subsp. australis and subsp. huamanpinta) and three changes of status are proposed (Ch. spinosa subsp. rotundifolia (Weddell) nov. stat., Ch. ulicina subsp. acicularis (Don) nov. stat. and Ch. erinacea subsp. hystrix (Don) nov. stat.). The name Ch. parviflora (Gris.) Hieron., which had been reduced to synonymy of Ch. oppositifolia Don, is rehabilitated, and the morphological and geographical differences between both species are discussed. A new epithet is proposed (Ch. morenonis (O. Ktze) nov. stat.) for Ch. argentea (Speg.) Speg., name invalidated by an earlier homonym. The name Ch. spinosa (Ruiz et Pav.) Don, erroneously used to designate the taxon here described as Ch. spinosa Less. Subsp. huamanpinta, is excluded form the genus. The following names are reduced to synonymy for the first time: Ch. erinacea f. pulvinata Cabrera; Ch. incana Phil.; Ch. insignis var. armata Weddell; Ch. johnstonii Tovar, Ch. jussieui var. lancifolia (H. et B.) Koster, Ch. kingii Ball, Ch. oppositifolia var. macrantha Gay; Ch. oppositifolia var. macrocephala Weddell, Ch. pseudoruscifolia Muschler; Ch. revoluta Field et Gardn, Ch. ulicina var. incana (Phil.) Johnston. [ABSTRACT FROM AUTHOR]

Thirty species of Inoperculate Discomycetes are described herein from the Nahuel Huapí National Park (Argentina), distributed among thirteen genera belonging to the following families: Hyaloscyphaceae, Dermataceae, Sclerotiniaceae y Helotiaceae. Three of them, namely, Calloria, Sphagnicola and Phaeohelotium are recorded for the first time for Argentina. Of the thirty species found, fifteen are new records for this country. The following new combinations are proposed: Cyathicula chlorosplenioides (Speg.) Gamundí (basinym: Helotium chlorosplenioides Speg.); Rutstroemia megalospora (Speg.) Gam. (bas.: Helotium megalosporum Speg.) y Rutstroemia microsperma (Speg.) Gamundí (bas.: Helotium microspermum Speg.). The paper contains a critical study of type material from Spegazzini's herbarium, and the description of a new species of the same general area: Phaeohelotium castaneum. [ABSTRACT FROM AUTHOR]

The geographical distribution of Bulnesia sarmientoi is extended to Brazil (Pantanal of Mato Grosso) on the basis of the works of Hoehne (1936) and Prance & Schaller (1982) Published and unpublished reports indicate that Bolivian populations would have bluish flowers. Since Argentine populations, have whitish flowers the possibility of polytypism for flower colour is indicated. [ABSTRACT FROM AUTHOR]